linux-ipsec - some contributions to the FreeS/WAN project (Linux IPSec implementation)
gfirewall - a GTK/GNOME tool for ipchains scripts creation
My attempt at secure VPN routing with ssh and ppd
I read through the VPN HOWTO (below) and I was not too happy because it wasn't what
I liked... RedHat. So here are the steps I took to get there and the scripts I used.
The VPN HOWTO - a guide to setting up a simple pppd+ssh based VPN.
Linux VPN Masquerade HOWTO - a guide to setting up a more complex VPN based on the IPSec standard.
Tunnelling through an SSL Proxy - this may be of interest if your firewall does not permit you to get to outside machines. You can tunnel over SSL (I presume port 80 is allowed).
VPN Information on the World Wide Web - all the VPN info you can stomach.
Security Portal - a site with security news, tools, and documents.
Crypto Archive - a cryptography document/software mirroring site.
Packet Storm - an internet security site.